property OnGDIOverlay: TNotifyEvent;
[ Note: Most likely this event will be removed in future versions. Do not use it ]
This event is called after the image has been combined with layers in the back-buffer and copied to the screen. In the event handler you can provide additional drawing using the standard Canvas of the control.
Drawing at this stage will not affect the contents of the back-buffer.
Paint Stages, OnPaintStage
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